I bought the brandnew rockpi4c, and try to boot from emmc.(Android9)
But, it cannot boot up. and led :green ON , blue blink twice (/ 1second).
I tried the SPI flash
- sudo rkdeveloptool db /path/to/rk3399_loader_spinor_v1.15.114.bin
output: Downloading bootloader succeeded.
- sudo rkdeveloptool wl 0 /path/to/rockpi4c-uboot-trust-spi_2017.09-2692-gdf20631bd8_20200824.img
output: Write LBA from file (100%)
- reboot the rockpi4c (maskrom mode, )
sudo rkdeveloptool rd
will output: Reset Device Failed. <<<< ???
I tried this process several time, but,
What should i do?